FaceSaver Format Revealed
A FaceSaver image is an ASCII file containing some or all of the
following lines:
FirstName:
LastName:
E-mail:
Telephone:
Company:
Address1:
Address2:
CityStateZip:
Date:
PicData: Actual data: width - height - bits/pixel
Image: Should be transformed to: width - height - bits/pixel
(A REQUIRED Blank line)
Hexified picture in scanline order, in the form suitable for
printing in postscript. It is unpadded scanlines, I believe left to
right. If it is bottom to top it is due to funny transforms in going
from the real scanned image, which came from a video camera turned on
its side! (to get a portrait aspect ratio). All the images are 8
bits per pixel, and have been intensity levelled to use up the full
dynamic range (each pixel multiplied by 256/(max-min) and shifted so
that min becomes zero). I'm sorry about that, I should have put out
untransformed data. The original frame grabbing was off a Targa M8,
and the gamma varied due to a number of real world factors. Most
pictures had a dynamic range in the 128--196 vicinity.
The line labeled Image: can be used to correct for non-square pixels.
In most cases, there are 108 (non-square) pixels across in the data,
but they would have been 96 pixels across if they were square.
Therefore, Image: says 96, PicData says 108.
Lou Katz
Saver of Lost Faces
lou@usenix.org
(415) 530-8870